The Complete Long COVID Handbook: Volume 5 MCAS & Histamine
by Dr. Robert Groysman, MD · Paperback
$23.99
softcover, printed on demand
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Your body feels like it is reacting to everything. Foods you always ate, smells, heat, even stress now set off flushing, hives, palpitations, headaches, or gut upset, often out of nowhere. You are not imagining new allergies. After COVID, mast cells, the immune cells that release histamine, can become overactive and fire when they should not.
Volume 5 covers mast cell activation and histamine intolerance, one of the six root mechanisms behind Long COVID. It names the mechanism behind reactions that seem random, and the steps that calm the system, in plain language you can bring to your own clinician.
What you’ll find
Chasing each reaction one at a time is exhausting and rarely works. This volume names the mechanism behind them, so you can calm the system instead of dodging one trigger after another.

Robert Groysman, MD
He began treating Long COVID before it had a name, after a stellate ganglion block unexpectedly restored the taste and smell in his post-COVID patients. That was the first clue that something deeper was going on.
He has experienced Long COVID himself. This series is based on findings in his own practice.
Written for a patient, not a textbook
“Dr. Groysman is to the point and does not fill his books with useless fluff. Every page is full of useful information.”
“Helps explain a lot.”
Reading the whole framework?
Mast cell activation is one of six mechanisms. The seven-volume set covers all of them and saves you $18.93 over buying each book on its own.
See the complete set, $149Next: Volume 6, Endothelial Dysfunction and Microclots
